Improvement in steam-generators



lllnitd gitana ,entre arpa.

JAMES STUART, OF SANFRANCISCO, CALIFORNIA.

Lette-rs Patent No. 94,666, dated September7, 1869.

IMPROVEMENT IN STEAM-GENERATORS. l

HPO*- Tlwle Schedule referred to :in these Letters Patent and niakng parl: of the same.

in the art to make and use the same, reference being had to `the'accompanying drawing, forming part ot' this specification.

The object ofthis invention is to provide an improved arrangement for marine steam-generating boilers, calculated to make a better application of the heat, and to afford better facilities for working wit-hin the boiler, for repairing, die.

Figure l represents a front elevation, partly broken out, ofa boiler constructed according to my improvements.

Figure 2 represents a central longitudinal sectional elevation, taken on the line -x of lig. l.

Similar letters of reference indicate ,corresponding v parts.

In the common arrangement of these boilers, the product of combustion passes directly backward from the lires, which are in front. This plan requires, in order to heat the whole ofthe front of the boiler, that the lire-surface extend wholly across the front, thereby making an undue amount of fire-surface.

According to my arrangement, I make the boiler short-er and broader, and vprovide only the necessary amont of tire-space A A, say about half the breadth now used, but extending the whole length, and conduct the `product of the re to the right and lefttherefrom by theshort tubes B, leading into the spaces C, one on each side, extending the whole lengt-h and depth of the water-space, or nearly. so, and of the proper width for a man to work in for repairing.

Above the large lues B are small return-tubes D, leadt ing from these spaces C hack to a wide central spaee,

E, also running t-hewhole length of the boiler, and also made a little wider than the length ofthe lines D,

to permit taking them out and putting in new ones.

From this space the passage for the productof combustion leads into the chimney orsmoke`-staek F, which in this instanceI have made half'circular, and open on one side at G, for the connection of' the smoke-stack ofa similar boiler fronting this,r which is a convenient arrangement in respect of' space and for stohing.

By this arrangement, I produce a lunch more economical boilerin c mseq11e1ice ot the more direct application of the heat to the water, and I may thereby enlarge the heating-surface proportionately to the firesurface.

Having thus described my invention,

What I. claim as new, and desire to secure by Leiters Patent, is-

The fire-spaces A, arranged centrally, and extending the whole length of the boiler, the lateral tubes B, the spaces C, and return-tubes D, leading into the space E, all arranged substantially as specified.

JAMES STUART.

Witnesses:

Tnonns J HANLY, J AMES G. CAnsoN. 

